Fix staging validator type change bug

internal/migrate/stage_contract.go

@@ -128,7 +128,7 @@ func stageContract(
 			}
 		} else if err != nil {
 			logger.Error(validator.prettyPrintError(err, common.StringLocation(contract.Location)))
-			return nil, fmt.Errorf("errors were found while validating the contract code, and your contract HAS NOT been staged, you can use the --skip-validation flag to bypass this check")
+			return nil, fmt.Errorf("errors were found while attempting to perform preliminary validation of the contract code, and your contract HAS NOT been staged, however you can use the --skip-validation flag to bypass this check & stage the contract anyway")
 		} else {
 			logger.Info("No issues found while validating contract code\n")
 			logger.Info("DISCLAIMER: Pre-staging validation checks are not exhaustive and do not guarantee the contract will work as expected, please monitor the status of your contract using the `flow migrate is-validated` command\n")

internal/migrate/staging_validator.go

@@ -153,6 +153,11 @@ func (v *stagingValidator) ValidateContractUpdate(
 		interpreterProgram,
 		v.elaborations,
 	)
+	chainId, ok := chainIdMap[v.flow.Network().Name]
+	if !ok {
+		return fmt.Errorf("unsupported network: %s", v.flow.Network().Name)
+	}
+	validator.WithUserDefinedTypeChangeChecker(newUserDefinedTypeChangeCheckerFunc(chainId))
 
 	err = validator.Validate()
 	if err != nil {
@@ -438,3 +443,30 @@ func (a *accountContractNamesProviderImpl) GetAccountContractNames(
 ) ([]string, error) {
 	return a.resolverFunc(address)
 }
+
+// TEMPORARY: this is not exported by flow-go and should be removed once it is
+// This is for a quick fix to get the validator working
+func newUserDefinedTypeChangeCheckerFunc(
+	chainID flow.ChainID,
+) func(oldTypeID common.TypeID, newTypeID common.TypeID) (checked, valid bool) {
+
+	typeChangeRules := map[common.TypeID]common.TypeID{}
+
+	compositeTypeRules := migrations.NewCompositeTypeConversionRules(chainID)
+	for typeID, newStaticType := range compositeTypeRules {
+		typeChangeRules[typeID] = newStaticType.ID()
+	}
+
+	interfaceTypeRules := migrations.NewInterfaceTypeConversionRules(chainID)
+	for typeID, newStaticType := range interfaceTypeRules {
+		typeChangeRules[typeID] = newStaticType.ID()
+	}
+
+	return func(oldTypeID common.TypeID, newTypeID common.TypeID) (checked, valid bool) {
+		expectedNewTypeID, found := typeChangeRules[oldTypeID]
+		if found {
+			return true, expectedNewTypeID == newTypeID
+		}
+		return false, false
+	}
+}